Hack saw



Dec. 6, 1955 5. G. GLENN 2,725,911

HACK SAW Filed Oct. 29, 1953 Fly. 6

George 6. Glenn JNVENTOR.

Amme s United States PatentO,

This invention relates to a hack saw and more specifically provides a hack saw having novel means for retaining the hack saw blade in operative position.

An object of this invention is to provide a hack saw having a com operated means for retaining the hack saw blade in operative position.

Another object of this invention is to provide a cam operated hack saw blade retaining means wherein the cam operating means is concealed in the handle of the hack saw when the blade is in operative position.

Yet another object of this invention is to provide a hack saw which is simple in construction, efiicient in operation, quick and easy in blade changing and inexpensive to manufacture.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being bad to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout and in which:

Figure 1 is a side elevational view of the hack saw of this invention;

Figure 2 is a bottom plan view of the structure of Figure 1;

Figure 3 is an end view of the structure of Figure 1 looking at the handle of the hack saw;

Figure 4 is a longitudinal, vertical section taken substantially along section line 44 of Figure 3 showing details of the cam operating means in its operative position;

Figure 5 is a sectional view similar to Figure 4 showing the cam operating means in released position;

Figure 6 is a transverse, top plan section taken substantially along section line 6-6 of Figure 5 showing details of the handle attaching means; and

Figure 7 is a longitudinal, vertical section taken substantially along section line 7-7 of Figure 4 showing details of the elongated operating means and the cam roller thereon.

Referring now to the drawings, it will be seen that the numeral 10 generally designates the hack saw of this invention including an L-shaped frame member having an elongated normally horizontal leg 12 and a short normally vertical leg 14 at right angles to the leg 12. The remote end of the leg 14 includes a pair of angularly extending pins 16 for receiving the apertured end portion of a hack saw blade 18. As shown in Figure 1, a handle member 20 is secured on the remote end of the elongated leg 12 and an angulated lever or member 22 is secured to the handle member 20 and forms an extension having angularly extending pins 24 thereon for engaging the opposite apertured end of the hack saw blade 18 wherein the hack saw blade 18 is positioned between the members 22 and 14 on the pins 24 and 16 in an obvious manner.

As shown in Figures 3-7, the handle 20 is composed of a separable, complemental pair of hollow half sections 26 secured together by a pair of set-screws 28 with the uppermost screw 28 connecting the handle 20 to the 2 a elongated leg 12 of the frame member. The end of the leg 12 is provided with aligned apertures 30 in longitudinally spaced relation with the center aperture receiving the screw 28 and the end apertures receiving projecting studs 32 from the interior of one-half of the handle member 20. The studs 32 associated with the apertures 30 form a rigid connection between the elongated leg 12 and the handle sections 26. As shown in Figure 5, the angulated member 22 has an angularly extending portion 34 extending into the hollow interior of the handle and projecting through a slot 36 in the forward edge of the handle 20. The angulated member 22 is pivoted in the handle member 20 by a pivot pin 38 extending between the sections 26 of the handle 20. It will be seen that the undersurface of the extending portion 34 forms an abutment surface for an operating handle or lever 40 having a cam roller 42 journaled on its upper end by a pivot pin 44. The operating handle 40 is pivoted between the handle sections 26 by a suitable pivot pin 46 and the rear portion of the handle 40 has a contour similar to .the rear contour of the handle sections 26 and a slot 48 isprovided in the handle 24 receiving the operating handle 40. The lower end of the slot 48 is enlarged as indicated by the numeral 50 and the elongated operating handle 40 has a portion 52 receivable in the enlarged portion of the slot 48. As shown in Figure 7, the lower assembling set-screw 28 is positioned in a recessed manner to provide a smooth surface to the handle and the handle sections 26 are provided with inwardly extending bosses 54 which abut each other and accurately space the lower section of the handle sections 26 and 26 in correct position. The bosses 54 also act as a stop for the operating handle 40 wherein the operating handle 40 is maintained in operative position. It will be seen that the axis 44 of the roller 42 shifts about the pivot pin 46 of the operating handle 40 when the operating handle 40 is brought into the slot 48 wherein the roller 42 is in engagement with the undersurface of the projecting portion 34 of the angular member 22. When the handle 40 is completely received in the slot 48 the center of the roller 44 has shifted to the opposite side of the pivot pin 46 wherein the force directed against the roller 42 tends to retain the operating handle 40 in its closed position in the handle 20. As will be seen, the hack saw blade 18 may be placed in a vertical position or in a horizontal position for cutting at angular relations to the frame legs 12 and 14.

From the foregoing construction, the operation of the device will be readily understood. With the device in the assembled position as shown in Figure 1, the handle 40 is moved outwardly of the handle 20 by the operator grasping the enlarged portion 52 of the operating handle 40 and pulling outwardly of the handle 20. The operating handle 40 will pivot about the axis 46 wherein the roller will permit the angular member 22 to be pivoted about its pivot axis 38 thereby releasing the hack saw blade 18 as the pins 24 and 16 are moved toward each other. The hack saw blade 18 is then replaced with a new blade or on the angularly disposed pins and the operating handle 40 is pushed downwardly into the slot 48 in the handle member 20. The roller 42 engages the undersurface of the extending portion 34 of the angulated member 22 thereby urging the pins 24 away from the pins 26. When the roller 42 urges the portion 34 upwardly the operating handle 40 assumes a position substantially flush with the rear portion of the handle 20 wherein the axis of the cam roller 42 has shifted to the other side of the axis 46 thereby retaining the elongated handle member 40 in its closed position wherein the hack saw blade is assembled for use. Obviously, the device may be adjusted for various sized hack saw blades by merely making the elongated leg 12 adjustable in the .-fatented Dec. 6, 1 955v V conventional manner now used in back saws if it is deemed advisable. All of the elements of this invention except the hack saw blade are constructed of aluminum or other non-corrosive material being relatively light in weight and sturdy in construction. Obviously, the device may be used as a hack saw or meat saw and the novelblade changing means provides a quick and eflicient method for changing the blades either for replacement, angular adjustment or to employ different typ'e'blades. The handle member 20 obviously is provided with suitable bosses for receiving the assembling screws 28 and the handle surfaces may be provided with suitable knurled portions for eflicient gripping by the operator of the saw.

From the foregoing; the construction and operation of the device will be readily understood and further explanation is believed to be unnecessary. However, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the appended claim.

What is claimed as new is as follows:

A hack saw comprising: a substantially L-shaped frame having end and center apertures in one end portion, a substantially hollow handle removably mounted on said one end portion oi said frame; said handle including separable complemental helf-sections --receiving the frame therebetween, means comprising a screw passing through the center aperture for securing said half-sections together on the frame, studs on one of the half-sections engaged in the end apertures for anchoring the frame in the handle, an angulated lever pivotally mounted at an intermediate point on the handle and having one end portion operable therein, a blade connected to the frame and to the lever and an operating lever pivotally mounted in the handle and engaged with said one end portion of the first named I lever for actuating same for tensioning the blade.

References Cited in the file of this patent 

